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US 8,920,520 B2Granted
Methods of preparing polysaccharide sheets for esterification
AssigneeCelanese Acetate LLC
InventorsThomas S. Garrett, Lawton E. Kizer, Henry P. Stogner
Life of this patent
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Abstract
Processing of cellulose, and more particularly, fiber opening and downstream processing and chemistry are provided. A process includes moistening a cellulose sheet stock to a water content in a range from about 20% to about 50%, attriting the moistened cellulose sheet to a wet pulp, flash drying the wet pulp to a floccule of cellulose having a moisture content from about 4% to about 8%, and esterifying the floccule of cellulose to provide a cellulose ester product.
Claims23
A process comprising:
- moistening a cellulose sheet stock to a water content in a range from about 20% to about 50%;
- attriting the moistened cellulose sheet to a wet pulp;
- flash drying said wet pulp to a floccule of cellulose having a moisture content from about 4% to about 8%, wherein flash drying is conducted in a flash dryer having an inlet temperature of about 105° C. to about 200° C. and an outlet temperature of about 60° C. to about 130° C.;
- and
- esterifying said floccule of cellulose to provide a cellulose ester product.
2 more elements
A process comprising:
- (a) moistening a cellulose sheet stock to a water content in a range from about 20% to about 50%;
- (b) attriting the moistened cellulose sheet to a wet pulp;
- (c) flash drying said wet pulp to a floccule of cellulose having a moisture content from about 5% to about 8%, wherein flash drying is conducted in a flash dryer having an inlet temperature of about 105° C. to about 200° C. and an outlet temperature of about 60° C. to about 130° C.;
- (d) esterifying said floccule of cellulose to provide a cellulose ester product;
- and
- (e) forming a fiber tow from said cellulose ester product.
3 more elements
A process comprising:
- moistening a cellulose sheet stock to a water content of the cellulose sheet stock is about 20% to about 50%;
- attriting the moistened cellulose sheet to a wet pulp, wherein a water content of the wet pulp is about 20% to about 50%;
- delivering the wet pulp to a flash dryer;
- flash drying said wet pulp to a floccule of cellulose, wherein a water content of the flocculate of cellulose is about 4% to about 8%, and wherein the flash dryer has an inlet temperature of about 105° C. to about 200° C. and an outlet temperature of about 60° C. to about 130° C.;
- and
- esterifying said floccule of cellulose to provide a cellulose ester product.
3 more elements
Dependencies are inferred from the claim text.